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Can two Line Chokes be connected in series for Altivar 31/61/71 Drives, in case the correct value Line Choke is not available.

Yes, two smaller Line Chokes can be connected in series for Altivar 31/61/71 Drives.

Note:

The drop voltage of Line Choke is approximately 3% of the supply voltage at nominal current. For two series connected Line Chokes he drop voltage will be approximately 6%. So care must be taken to compensate this voltage drop, by supplying the Drive with a minimum of nominal Line Voltage plus 6% (Example for 400V supply, it should be 424V).